Bethesda, easily.

I defy you to name 2 RPG's by 1 company better then Fallout 3 and Oblivion.

Square Enix is, ever was and ever will be the best dudes, no questions.
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Though Oblivion was a damn nice RPG too :P

Bioware is defintely the king of RPG companies this gen. Square used to be good when they were squaresoft but ever since the merger and retards like yoichi wada in charge, its been going downhill. Atlus on the other hand is much better than SE. Demon Souls was a suprise hit and Persona 4 was probably one of the best RPG's i have ever played. They pwn SE out of the water when it comes to story and good character development. oh and as for bethesda...yeeaaa they suck ass

Bethesda and Bioware. Bringing you groundbreaking and innovative RPGs since... whenever they released their first games.

Nintendo.

Paper Mario and Mario&Luigi

Square No Doubt.

AlphaDream

Square Enix for Jrpg's
Bioware and Bethesda for wrpgs

i would say Level 5 they made great RPGs like
Dark Cloud (2000)
Dark Chronicle (Dark Cloud 2) (2002)
Dragon Quest VIII: Journey of the Cursed King (2004)
Rogue Galaxy (2005)
Rogue Galaxy: Director's Cut (2007
White Knight chronicles


In My Option i think there the best

Atlus and Square